Improved method of promoting combustion in furnaces



CLARK FISHER, OF T RENTON, NEW JERSEY.

IMPROVED METHOD 0F PROMOTING COMBUSTION IN FURNACES.

Specification forming part of LettersPatent No. 58,239, dated September 25, 1866.

To all whom t may concern:

Beit known that I, CLARK FIsI-IEE, of Trenton, in the county of Mercer and State of N ew Jersey, have invented a new and Improved Method of Promoting the Combustion of Coal for Steam and other purposes; and I do hereby declare that the following is a full, clear and exact description thereof, reference being had to the accompanying drawings, making a part of this specification, in which-- i Figure 1 is a vertical longitudinal section -through one form of steam-boiler and furnace having my invention applied. Fig. 2 is a transverse section through Fig. 1, taken in the vertical plane indicated by red lines x. Fig. 3 is a front elevation.

The object of this invention is to effect a rapid and at the same time an economical combustion of coal in steam-boiler and other furhaces; also, to effect the consumption ofsmoke and gas in the furnace in a more perfect manner than hitherto accomplished.

It consists in forcing upward one or more jets of cold air into the chimney or smokepipe of a furnace, by introducing the air under pressure into the chimney at a point which is above the healing-surface, and thus creating a partial vacuum in the iirechamber and `cause the air from the reroom to circulate through every part of said chamber, as will be hereinafter described.

To enable others skilled in the art to understand my invention, I will describe its construction and operation.

The principle of my invent-ion consists in forcing air into a smoke -pipe or chimney above the furnace or heating-chamber at a velocity which is considerably greater than that which would be obtained by a natural draft, thus obtaining, not only the required velocity or force of air, but also obtaining air in such quantity as will, by its friction on the surrounding column of air in the chimney, induce an accelerated upward current, and thus draw into the furnace-chamber a sufficient supply of air to promote a free and' perfect combustion of the coal and smoke therein.

'Io effect this object I employ a fan, A

which is inclosed within a case, and which receives a rapid rotar I motion. From the fancase a pipe or conduit, B, is carried upward and through the chimney or smoke-pipe C of the `furnace D, and its upper end terminates in a contracted nozzle, a, which is directed upward in or parallel with the axis of the chim ney, and which is located above the furnacechamber, so that the air shall not, by its cooling effect, carry off the heat below. This pipe B is contracted at its discharge end for the purpose of obtaining greater velocity of air, which, combined with quantity of air, produces the beneficial results above set forth.

By thus-forcin g air in jets into the chimney of a furnace the chimney will be kept at a comparatively low temperature above a certain point 5 and hence I secure safety from fire where chimneys or smoke-pipes pass up through the decks of vessels or through roofs of build l ings.

It is notonly found,by forcin gair under pressure into chimneys, that the combustion in the furnace is more complete, but it is also found that bituminous coal can be burned very suc- Y cessfully and economically, with little or no escape of smoke and gas.

I am aware that attempts have been made to promote combustion in furnaces by a contrivance which would draw the heated air out of the lower part of the chimney and force it in again at a point higher up, with a damper between. Smoke jacks or fans have also been placedwin chimneys and driven by engines.

I am also aware that steam has been directed into chimneys through nozzles, as in the case of locomotive and other engines; but none of these plans do I lay any claim to.

What Ido claim as new, and desire to secure by Letters Patent, is-

The employment of Vfans or other suitable air-engines, having pipes -leading from them into the chimneys and directed upward, for the purpose of promoting the combustion of fuel in furnaces by forcing coldair directly into the chimneys at points which are above the heating-surfaces, butgnear the base of the chimneys,. at a greater velocity than that which would result from natural draft, substantially asi described.

Witness my hand in matterof my application for a patent for an improved mode of promoting the combustion of coal for steam or other purposes.

CLARK FISHER.

Witnesses:

` T. W. LEAcH,

HENRY M. RICKETT, W. L. NIcoLL. 

